The researchers used data on screening urine dipsticks from 8,954 healthy school children ages 8 to 15. Of that number, 1,264 children or 14.2% had abnormal results, at which time a dipstick test was repeated. Only 319 of the number had a repeat abnormality, with 11 of the 8,954 children, or about 0.1%, ultimately having some form of chronic kidney disease. The findings were published in the journal Pediatrics.

According to the researchers, the cost of a dipstick was estimated taking into account supply costs and labor to administer by a licensed practical nurse. Assuming three minutes to complete the test, and excluding administrative and overhead costs, the cost of a test came to $3.05. Including patients requiring retests, the price rose to $3.47 per patient. With a rate of one case of diagnosed chronic kidney disease per 800 screenings, the cost was $2997.50 per case diagnosed.

Deepa Sekhar, assistant professor of pediatrics, said: “Screening urine dipsticks have routinely been performed on healthy children in primary care offices for decades. The AAP made the recommendation to discontinue screening urine dipsticks in healthy children to test for chronic kidney disease in 2007. However, the practice has still been in use.

“A screening test should be inexpensive and widely available, and a positive result should prompt timely evaluation. Most important, early detection should lead to an intervention that prevents morbidity and/or mortality. Screening urine dipstick meets the first three requirements, but fails to satisfy the last. It remains unproven that early detection alters the course of a child who is destined to progress from chronic kidney disease to end-stage renal disease.”